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Inventories - Movements in the allowance for obsolescence of inventories (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Movements in the allowance for obsolescence of inventories |  |
At the beginning of the year | $ 1,278 |
At the end of the year | 1,854 | $ 1,278
Accumulated impairment |  |
Movements in the allowance for obsolescence of inventories |  |
At the beginning of the year | (54) | (86)
Additions - Fees for services, maintenance and materials | (17) | (45)
Uses | 24 | 77
At the end of the year | $ (47) | $ (54)

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- Definition The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_36_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of utilisation of allowance for obsolescence of inventories. + References No definition available. + Details
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